Hi Mate, I would suggest ScanGauge2 (Scangauge2.com) It is a trip computer and code reader and you can have all sorts of guages displaying info from the ECU loke Air temp Revs etc.
Be careful to check if it is going to work on your MY02 as I have an MY04 and the SG2 does not seem to connect on that model. I have an RX not a WRX and I know the WRX and STi are OK from MY04. Strange issue with the OBDII type Protocol and ECU codes for 2004.
Joffa
Australia
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